# Modular Relay Module 4R-D7 Modbus RTU, 4-channel relay interface (No name)

**URL:** https://aio.lv/en/product--no-name-4r-d7--11959908
**Data updated:** 2026-03-11 13:59 (EET)
**Category:** Home Automation
**Manufacturer:** No name
**Manufacturer code:** 4R-D7
**EAN:** 5902887067327
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 14.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 12.39 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--no-name-4r-d7--11959908

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Modular relay module 4R-D7 with Modbus RTU communication provides a 4-channel relay interface for integration into automation and control systems. Supplied by manufacturer No name (MPN 4R-D7), it supports serial Modbus RTU for remote control and status monitoring of connected loads. Typical uses include building automation, industrial control panels, and remote switching of lighting, pumps or actuators where a Modbus RTU relay output is required.

## Long description

The Modular Relay Module 4R-D7 Modbus RTU is a 4-channel relay interface designed for integration into Modbus RTU networks. It provides four independent relay outputs controllable over a serial Modbus RTU connection, enabling remote switching and status monitoring of connected loads. The module is suitable for building automation, industrial control panels and other systems that require reliable relay outputs accessible via Modbus RTU.
Advantages
The module offers four relay channels in a compact modular form factor, allowing centralized control of multiple loads via a single Modbus RTU link. Serial Modbus RTU communication simplifies integration with PLCs, SCADA systems and other Modbus masters while enabling remote status reads and control commands. Its straightforward interface reduces wiring complexity and supports common applications such as lighting, pumps and actuator control where relay outputs are appropriate.
Suitable for
Building automation: control of lighting, ventilation and HVAC peripheral devices
Industrial control panels: switching of machines, indicators and auxiliary equipment
Remote switching: pumps, valves and actuators that require on/off control via Modbus RTU
Integration with PLCs and SCADA systems requiring relay outputs
Key specifications
Number of relay channels: 4 independent outputs
Communication protocol: Modbus RTU (serial)
Interface type: relay outputs for on/off switching
Form factor: modular relay module for panel or DIN-rail mounting environments (module style)
How to use
Install the 4R-D7 module in the control panel or on the intended rail or mounting point and connect the relay outputs to the loads using appropriate gauge wiring and protective devices. Connect the serial Modbus RTU bus lines (A/B or TX/RX and ground as applicable) to the Modbus master device and configure the communication parameters (baud rate, parity, stop bits and device address) on both the module and the master. Use Modbus RTU function codes supported by the system to read relay status and to issue on/off commands for each channel. Verify wiring polarity and protective fusing before energizing the circuit.
Usage recommendations
Use the module with compatible Modbus RTU masters and follow electrical safety standards: select relays and wiring rated for the connected load, add external protection (fuses or breakers) where required, and ensure proper grounding and isolation between control and power circuits.

## FAQ

### How much does the Relay Module No name 4R-D7 Modbus RTU cost, and is it available for purchase?

The price is 14.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 63 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 07.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All No name products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized No name service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11959908/67405323_large.webp